Arize Phoenix

Open-source tracing + eval.

Evals Elastic-2.0 Open source Checked 2026-08-15

The record

Verified by hand

Category: Evals
License: Elastic-2.0
Open source: Yes
Self-host: Yes

Entry price: Free
Rank in category: #8 of 11
Website: phoenix.arize.com
Price check: Confirmed against official page

Our take

In progress

Arize Phoenix sits at #8 in Evals by adoption. The verified facts are above; the full editorial assessment — where it wins, where it doesn't, and what to reach for instead — is being written and will land here.

Know this tool well? A correction or first-hand note helps the next reader. Suggest an edit →

Alternatives in Evals

Ranked

LangSmith#1

Tracing + eval workflows.

$39/seatProprietary

Langfuse#2

Open-source tracing + evals.

$29/moMIT

Promptfoo#3

CI-gated eval + red-teaming (OpenAI).

FreeMIT

Braintrust#4

The production quality loop, flat rate.

$249/moProprietary

Sources

Checked 2026-08-15

Official sitephoenix.arize.com✓ Price verified